Read and match. 配对。从B栏中选出能回答A栏问题的答案。
What class are you ________？ A．at B．in C．on
How old ________ your brother? A．is B．are C．does
Where ________ your father now? A．is B．are C．was
I can't ________ my key. A．look for B．find C．look
I was born ________ Beijing. A．at B．in C．on
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